Candidatus Phytoplasma Meliae’

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Candidatus Phytoplasma Meliae’ bioRxiv preprint doi: https://doi.org/10.1101/2020.06.01.128413; this version posted June 2, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Title: Diversity analysis of amp gene sequences in the ‘Candidatus Phytoplasma meliae’ 2 Authors: Franco D. Fernández1,2, and Luis R. Conci1,2* 3 1. Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias 4 (CIAP), Instituto de Patología Vegetal (IPAVE). Camino 60 cuadras km 5 ½ (X5020ICA), Córdoba. 5 Argentina 6 2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Unidad de Fitopatología y 7 Modelización Agrícola (UFYMA). Camino 60 cuadras km 5 ½ (X5020ICA), Córdoba. Argentina 8 * Corresponding author: Luis R Conci, e-mail: [email protected] 9 10 Keywords: Phytoplasma, antigenic membrane protein, selection pressure, chinaberry, MPV 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 bioRxiv preprint doi: https://doi.org/10.1101/2020.06.01.128413; this version posted June 2, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 26 Abstract 27 Phytoplasmas are plant pathogenic bacteria transmitted by insects. As endosymbiotic bacteria that lack a 28 cell wall, their membrane proteins are in direct contact with host cytoplasm. In phytoplasmas the 29 immunodominant membrane proteins (IDPs), are the most abundant proteins of the cell membrane. The 30 antigenic membrane protein (Amp), one of the three types of IDPs, is characterized by a positive selection 31 pressure acting in their extracellular domain. In South America, the ‘Candidatus Phytoplasma meliae’ has 32 been associated to chinaberry yellows disease. In the present work, we describe for the first time the 33 structure, phylogeny and selection pressure of amp gene in sixteen ‘Candidatus Phytoplasma meliae’ 34 isolates. Our results indicate that amp gene sequences preserve the structure, large extracellular domain 35 flanked by to hydrophobic domains in the N- (signal peptide) and C-termini (transmembrane), previously 36 described in its orthologues and high divergence in the amino acids residues from extracellular domain. 37 Moreover, a positive selection pressure was detected predominantly in this region confirming previous 38 reports. 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 bioRxiv preprint doi: https://doi.org/10.1101/2020.06.01.128413; this version posted June 2, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 56 Introduction 57 Phytoplasmas are cell wall-less bacteria that inhabit sieve cells in the phloem tissue of infected plants and 58 are transmitted from plant-to-plant by phloem-feeding insect vectors, principally leafhoppers (Zhao et al. 59 2015). These pathogens are associated with plant diseases in several hundred plant species, including many 60 important food, vegetable and fruit crops, ornamental plants, timber and shade trees (Bertaccini and Lee, 61 2019). In South America, China berry trees (Melia azedarach L) are affected by two different 62 phytoplasmas, ‘Candidatus Phytoplasma meliae’ (group 16SrXIII, subgroups –C and –G) (Fernández et al. 63 2016) (Figure 1A) and ‘Candidatus Phytoplasma pruni’ (group 16SrIII, subgroup B) (Galdeano et al. 2004). 64 In Argentina, ‘Ca. P. meliae’ is restricted to North-East region while ‘Ca. P. pruni’ has a wider distribution 65 covering different regions of the country (Arneodo et al. 2007; Fernandez 2015). The differential 66 distribution of these two phytoplasmas could be linked to the distribution of its insect vector, considering 67 that each species of phytoplasmas establishes a unique relationship with the insect that has the ability to 68 transmit it. Nevertheless, in this case this hypothesis has not been confirmed yet. In this context, the study 69 of membrane proteins is a reliable approach to understand the molecular dialogue between insect vectors 70 and phytoplasmas. This group of pathogens lacks a cell wall, thus their membrane proteins are in direct 71 contact with the host cytoplasm (Konnerth et al. 2016). The immunodominant membrane proteins (IDPs) 72 are a group of proteins that comprises a major portion of total cellular membrane proteins in phytoplasmas 73 (Kakizawa et al. 2004). To date, three non-orthologous IDPs types have been described: Imp 74 (immunodominant membrane protein), Amp (antigenic membrane protein) and IdpA (immunodominant 75 membrane protein A) (Kakizawa et al. 2006a). The Amp protein is constituted by a large extracellular 76 domain flanked by two hydrophobic domains in the N- (signal peptide) and C-termini (transmembrane) 77 (Arashida et al. 2008; Barbara et al. 2002; Kakizawa et al. 2006a). Previous studies have shown great 78 variability in the extracellular domain accompanied by high selection positive pressure (Fabre et al. 2011; 79 Kakizawa, et al. 2006b). This selection pressure is suggested to be associated with the key role that it plays 80 in the interaction of phytoplasmas with insect vectors (Suzuki et al. 2006). So far, studies carried out with 81 the Amp protein have been only described in aster yellows group phytoplasmas (16SrI, ‘Ca. Phytoplasma 82 asteris’) and Stolbur (16SrXII, ‘Ca. Phytoplasma solani’). In South America, there are no reports about the 83 Amp protein in ‘Ca. Phytoplasma meliae’ and related phytoplasmas of the 16SrXIII group (Mexican 84 periwinkle virescence). In this scenario, the goal of this work was to describe the main features of Amp in 85 diverse geographical isolates of 'Ca. Phytoplasma meliae' present in Argentina to study its variability and 86 selection pressure processes. 87 Materials and methods 88 Sample source 89 Total DNA from sixteen (n=16) chinaberry tree naturally infected with ‘Candidatus Phytoplasma meliae’ 90 were used in molecular analyzes. This DNA collection was obtained from different geographical locations 91 situated in the northeast of Argentina (Table 1, Figure 1A). For DNA extraction CTAB protocol (Doyle 92 and Doyle 1990) was used. Detection and identification of ‘Candidatus Phytoplasma meliae’ was accessed 93 by PCR and PCR-RFLP as described previously (Fernández et al. 2016). Briefly, PCR detection was bioRxiv preprint doi: https://doi.org/10.1101/2020.06.01.128413; this version posted June 2, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 94 conducted using universal primers P1/P7 (Deng and Hiruki 1991) and R16F2n/R16R2 (Lee et al. 1994) in 95 direct and nested reactions. Nested PCR amplicons (1.2kb) were subjected to digestion using MseI, HpaII, 96 RsaI and HaeIII (NEB, USA) endonucleases and RFLP profiles were compared to reference patterns of 97 subgroups 16SXIII-G and 16SrIII-B. 98 Amplification and sequencing of groEL-amp-nadE region 99 DNA from ‘Ca. Phytoplasma meliae’ (isolate ChTYXIII-Mo3) was used as reference DNA for sequencing 100 genomic fragment containing groEL (partial)-amp (complete)-nadE (partial) genes. Firstly, a degenerate 101 primer pair (groEL-Fw1/nadE-Rv2) (Table 2) was designed manually based in the sequences of groEL 102 (cpn60) and nadE genes from related ‘Ca. Phytoplasma species’ available in GenBank. Amplification of 103 3.2 kb was obtained and directly sequenced from both ends using the same primers. Based on these 104 sequences new specific primers pair (groEL-ChTYFw1/nadE-ChTYRv1), which amplified a putative 105 fragment of 2.0 kb, were designed using Primer3 implemented in Geneious R.10 (Biomatters, USA). PCR 106 amplifications were conducted in a final volume of 50 µl, containing 1.5U of Dream® Taq polimerase 107 (Fermentas, Lituania), 0.4 µM of each primer, 100 µM of dNTPs and 1X buffer Dream Taq (2 mM MgCl2). 108 For 2.0 kb amplification PCR conditions used were, 3 minutes 94ºC for initial denaturation and 35 cycles 109 of 94ºC/1minute, 58ºC/1 minute and 72ºC/3 minutes, with final extension of 72ºC for 10 minutes. The PCR 110 product (2.0 kb) was purified using S-400 HR columns (GE, UK) and cloned in pGEM T-Easy system 111 (Promega, USA) according to the manufacturer instructions. The complete sequence of 2.0 kb amplicon 112 was obtained by primer walking strategy in three different clones (Macrogen, Korea). 113 Structural analysis 114 Open reading frames were estimated using ORF Finder in Geneious R.10 software. Annotation of amino 115 acidic deduced sequences was performed using BLASTp (nr, BLOSUM62, word size 6). For Amp-ORF 116 signal peptide sequence and the cleavage site were predicted with the program SignalIP v5.0 117 (http://www.cbs.dtu.dk/services/SignalP/) as well as the presence of the transmembrane domains with 118 TMHMM v2.0 program (http://www.cbs.dtu.dk/services/TMHMM/). Also, the conserve domains were 119 analyzed by CD-Search online tool (https://www.ncbi.nlm.nih.gov/Structure/cdd/wrpsb.cgi). 120 Phylogeny 121 For phylogeny reconstruction multiple alignments of amino acid sequences were conducted using MAFFT 122 (L-INS-i, 200PAM/K=2, gap open penalty=1.53, offset value=0.123) (Katoh and Toh 2008), from Amp 123 sequences obtained in this work and from related phytoplasmas groups (16SrI and 16SrXII) available from 124 GenBank.
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    Great Clarendon Street, Oxford 0X2 6DP Oxford University Press is a department of the University of Oxford. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide in Oxford New York Athens Auckland Bangkok Bogotá Buenos Aires Calcutta Cape Town Chennai Dar es Salaam Delhi Florence Hong Kong Istanbul Karachi Kuala Lumpur Madrid Melbourne Mexico City Mumbai Nairobi Paris São Paulo Shanghai Singapore Taipei Tokyo Toronto Warsaw with associated companies in Berlin Ibadan Oxford is a registered trade mark of Oxford University Press in the UK and in certain other countries Published in the United States by Oxford University Press Inc., New York © Robin Hard 1997 The moral rights of the author have been asserted Database right Oxford University Press (maker) First published as a World’s Classics paperback 1997 Reissued as an Oxford World’s Classics paperback 1998 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior permission in writing of Oxford University Press, or as expressly permitted by law, or under terms agreed with the appropriate reprographics rights organizations. Enquiries concerning reproduction outside the scope of the above should be sent to the Rights Department, Oxford University Press, at the address above You must not circulate this book in any other binding or cover and you must impose this same condition on any acquirer British Library Cataloguing in Publication Data Data available Library of Congress Cataloging in Publication Data Apollodorus. [Bibliotheca. English] The library of Greek mythology / Apollodorus; translated by Robin Hard.
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